Class [Mammalia] Linnaeus, 1758 - mammals
   Order Rodentia Bowdich, 1821 - rodents
     Family Sciuridae Batsch, 1788 - squirrels, chipmunks, marmots, and prairie dogs
       Subfamily Pteromyinae Brandt, 1855 - flying squirrels
         Genus Glaucomys Thomas, 1908 - American flying squirrels
           Glaucomys sabrinus (Shaw, 1801) - northern flying squirrel
           Glaucomys volans (C. Linnaeus, 1758) - southern flying squirrel